package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@RequiredArgsConstructor
@Slf4j
public class DishServiceImpl implements DishService {
    private final DishMapper dishMapper;
    private final DishFlavorMapper dishFlavorMapper;
    private final SetmealDishMapper setmealDishMapper;

    @Override
    @Transactional // 开启事务,确保菜品表和菜品口味表都要插入成功
    public void saveWithFlavor(DishDTO dishDTO) {
        // 获取菜品实体类
        Dish dish = new Dish();
        // 属性拷贝
        BeanUtils.copyProperties(dishDTO, dish);
        // 设置菜品状态为禁用
        dish.setStatus(StatusConstant.DISABLE);
        // 往菜品（dish）表添加1条数据
        dishMapper.insert(dish);
        log.info("菜品id：{}", dish.getId());
        // 往菜品口味表(dish_flavor)添加多条数据
        // 不规范的写法：会导致数据库的性能下降。每一次循环都要连接数据库
        /*dishDTO.getFlavors().forEach(flavor -> {
            flavor.setDishId(dish.getId());
            dishMapper.insertFlavor(flavor);
        });*/
        // 获取菜品口味数据
        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
        // 确保前端传递了口味数据才往菜品口味表插入数据
        if (dishFlavors != null && dishFlavors.size() > 0) {
            // 组装插入菜品口味表所需的参数
            List<DishFlavor> flavors = new ArrayList<>();
            dishFlavors.forEach(flavor -> {
                // 创建一个DishFlavor对象
                DishFlavor dishFlavor = new DishFlavor();
                // 设置口味对应的菜品id
                dishFlavor.setDishId(dish.getId());
                // 设置口味名称和值
                dishFlavor.setName(flavor.getName());
                dishFlavor.setValue(flavor.getValue());
                flavors.add(dishFlavor);
            });
            // 批量插入菜品口味表
            dishFlavorMapper.batchInsertDishFlavor(flavors);
        }

    }

    @Override
    public PageResult<DishVO> pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        // 开启分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        // 多条件查询
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        // 设置分页结果对象
        PageResult<DishVO> pageResult = new PageResult<>();
        pageResult.setTotal(page.getTotal());
        pageResult.setRecords(page.getResult());
        return pageResult;
    }

    @Override
    @Transactional // 开启事务,确保菜品表和菜品口味表都要删除成功
    public void deleteBatch(List<Long> ids) {
        // 判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                // 当前菜品 still on sale
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        // 判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            // 当前菜品 still on sale
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品口味表中的数据
            dishFlavorMapper.deleteByDishId(id);
        }


    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {
        // 根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        // 创建dishVO对象
        DishVO dishVO = new DishVO();
        // 属性拷贝
        BeanUtils.copyProperties(dish, dishVO);
        //根据菜品id查询对应的口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        // 设置口味
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        // 构建菜品数据
        Dish dish = new Dish();
        // 拷贝
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        // 删除菜品口味表中该菜品的数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        // 获取菜品口味数据
        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
        // 确保前端传递了口味数据才往菜品口味表插入数据
        if (dishFlavors != null && dishFlavors.size() > 0) {
            // 组装插入菜品口味表所需的参数
            List<DishFlavor> flavors = new ArrayList<>();
            dishFlavors.forEach(flavor -> {
                // 创建一个DishFlavor对象
                DishFlavor dishFlavor = new DishFlavor();
                // 设置口味对应的菜品id
                dishFlavor.setDishId(dish.getId());
                // 设置口味名称和值
                dishFlavor.setName(flavor.getName());
                dishFlavor.setValue(flavor.getValue());
                flavors.add(dishFlavor);
            });
            // 批量插入菜品口味表
            dishFlavorMapper.batchInsertDishFlavor(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        // 根据分类id查询所有的菜品
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}
